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Android Kotlin Tutorial – Ranges

Range expressions are formed with rangeTo functions that have the operator form .. which is complemented by in and !in. Range is defined for any comparable type, but for integral primitive types it has an optimized implementation.

Will Kotlin replace Java? | Is Java Dead?

Kotlin is a language with better features than Java and Kotlin is also on JVM platform.
If you are a beginner to android development I would recommend you to learn Kotlin because in future Kotlin would be more in demand than Java, but Kotlin wont replace Java because many projects are already made in Java.
So replacement wont be possible.
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